Add a "fork" of musl as //fusl.

fusl/src/math/sinhf.c

+#include "libm.h"
+
+float sinhf(float x)
+{
+        union {float f; uint32_t i;} u = {.f = x};
+        uint32_t w;
+        float t, h, absx;
+
+        h = 0.5;
+        if (u.i >> 31)
+                h = -h;
+        /* |x| */
+        u.i &= 0x7fffffff;
+        absx = u.f;
+        w = u.i;
+
+        /* |x| < log(FLT_MAX) */
+        if (w < 0x42b17217) {
+                t = expm1f(absx);
+                if (w < 0x3f800000) {
+                        if (w < 0x3f800000 - (12<<23))
+                                return x;
+                        return h*(2*t - t*t/(t+1));
+                }
+                return h*(t + t/(t+1));
+        }
+
+        /* |x| > logf(FLT_MAX) or nan */
+        t = 2*h*__expo2f(absx);
+        return t;
+}